Aircraft



FIG. 1 is a front perspective view of an aircraft showing my new design;

FIG. 2 is a side elevational view thereof with the wheels extended condition, the opposite side elevational view being a mirror image of that shown.

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof. 

The ornamental design for an aircraft, as shown and described. 